package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * ClassName: ShoppingCartServiceImpl
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author 谢依雯
 * @Create 2024/12/4 12:33
 */
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加到购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);
        //如果已经存在了，只需要将数量加一
        if(list !=null && list.size()>0){
            ShoppingCart cart=list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumById(cart);
        }else {
            //如果不存在，需要插入一条购物车数据
            //判断本次添加到购物车的是菜品还是套餐
            Long dishId=shoppingCart.getDishId();
            if(dishId!=null){
                //本次添加到购物车的是菜品
                Dish dish=dishMapper.getId(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());
            }
            else {
                Setmeal setmeal=setmealMapper.getByid(shoppingCart.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> show() {
    ShoppingCart shoppingCart=ShoppingCart.builder()
            .userId(BaseContext.getCurrentId())
            .build();
    List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    public void clean() {
        shoppingCartMapper.clean(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
    ShoppingCart shoppingCart=new ShoppingCart();
    BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
    shoppingCart.setUserId(BaseContext.getCurrentId());

    List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);

    if(list!=null&& list.size()>0){
        shoppingCart=list.get(0);

        Integer num=shoppingCart.getNumber();

        if(num==1){
            //当前商品在购物车中的份数为1，直接删除当前记录
            shoppingCartMapper.deleteByid(shoppingCart.getId());
        }else {
            //当前商品在购物车中的份数不为1，修改份数即可
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
            shoppingCartMapper.updateNumById(shoppingCart);
        }
    }
    }
}
